package cn.web.lxxf;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

//@WebFilter(urlPatterns = "/lxxf/*")
public class CoreFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        //初始化
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
        //执行拦截的逻辑代码
        HttpServletRequest request = (HttpServletRequest)req;
        HttpServletResponse response = (HttpServletResponse)resp;

        String uri = request.getRequestURI();
        if("/lxxf/login.jsp".equals(uri) || uri.endsWith(".css")){
            chain.doFilter(req,resp);
            return;
        }


        HttpSession session = request.getSession();
        Object uid = session.getAttribute("UID");
        if(uid==null){
            response.sendRedirect("/lxxf/login.jsp");
            return;

        }
        chain.doFilter(req,resp);

    }

    @Override
    public void destroy() {
        //析构函数：当过滤器被销毁的时候被执行
    }
}
